The classic kneel that frees up tight hip flexors.
Tuck the pelvis first, then drive forward. Without the tuck you'll just arch and feel nothing.
Kneeling on one leg and shifting the hips forward lengthens the front of the trailing hip, the region that spends all day shortened by sitting. The wide, staggered base also asks the muscles around the outside of the hip to steady you, so each side gets a balance challenge along with the stretch. Done one side at a time, it earns its place before squats and lunges and after long days at a desk.
You are almost certainly arching your lower back instead of stretching the hip. Tuck the pelvis under and squeeze the glute of the kneeling leg first, then shift forward, the stretch should appear within an inch or two.
30 to 45 seconds per side, two or three rounds, breathing slowly. Aggressive lunging deeper does less than a modest position held with the pelvis properly tucked.
Both work, but before lower body sessions is where it pays off most, freeing the hips to reach depth in squats and full extension in lunges. Keep pre-workout holds shorter, around 20 to 30 seconds.
